// Copyright 2017 The Draco Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef DRACO_ATTRIBUTES_ATTRIBUTE_QUANTIZATION_TRANSFORM_H_
#define DRACO_ATTRIBUTES_ATTRIBUTE_QUANTIZATION_TRANSFORM_H_

#include <vector>

#include "draco/attributes/attribute_transform.h"
#include "draco/attributes/point_attribute.h"
#include "draco/core/encoder_buffer.h"

namespace draco {

// Attribute transform for quantized attributes.
class AttributeQuantizationTransform : public AttributeTransform {
  public:
    AttributeQuantizationTransform() : quantization_bits_(-1), range_(0.f) {}
    // Return attribute transform type.
    AttributeTransformType Type() const override {
        return ATTRIBUTE_QUANTIZATION_TRANSFORM;
    }
    // Try to init transform from attribute.
    bool InitFromAttribute(const PointAttribute &attribute) override;
    // Copy parameter values into the provided AttributeTransformData instance.
    void CopyToAttributeTransformData(
        AttributeTransformData *out_data) const override;

    void SetParameters(int quantization_bits, const float *min_values,
                       int num_components, float range);

    bool ComputeParameters(const PointAttribute &attribute,
                           const int quantization_bits);

    // Encode relevant parameters into buffer.
    bool EncodeParameters(EncoderBuffer *encoder_buffer) const;

    int32_t quantization_bits() const {
        return quantization_bits_;
    }
    float min_value(int axis) const {
        return min_values_[axis];
    }
    const std::vector<float> &min_values() const {
        return min_values_;
    }
    float range() const {
        return range_;
    }
    bool is_initialized() const {
        return quantization_bits_ != -1;
    }

    // Create portable attribute using 1:1 mapping between points in the input and
    // output attribute.
    std::unique_ptr<PointAttribute> GeneratePortableAttribute(
        const PointAttribute &attribute, int num_points) const;

    // Create portable attribute using custom mapping between input and output
    // points.
    std::unique_ptr<PointAttribute> GeneratePortableAttribute(
        const PointAttribute &attribute, const std::vector<PointIndex> &point_ids,
        int num_points) const;

  private:
    int32_t quantization_bits_;

    // Minimal dequantized value for each component of the attribute.
    std::vector<float> min_values_;

    // Bounds of the dequantized attribute (max delta over all components).
    float range_;
};

}  // namespace draco

#endif  // DRACO_COMPRESSION_ATTRIBUTES_ATTRIBUTE_DEQUANTIZATION_TRANSFORM_H_
